My dad is the president of the VMCC - http://www.vmcc.net/default.asp - alas it is several years since I have been on a motorbike, and I have never owned one, or in fact ridden one on the road
My old man has a Velocette Thruxton like this, only his is in boxes around the house. He keeps saying he will rebuild it but it has been that way for 35 years, I suspect it’s going to be his retirement project.